When Fi first introduced a GPS-enabled collar back in 2019, it set the bar for smart pet tech. Fast-forward to June 2025, and that innovation curve has only sharpened. On Monday, Fi unveiled the Series 3 Plus, its most advanced smart collar yet—one that brings AI-driven behavior detection and full Apple Watch integration to the canine world.

Gone are the days when collars merely counted steps and logged sleep. Fi’s Series 3 Plus collars are trained on what the company calls “the largest collection of dog data in the world,” encompassing hundreds of breeds across diverse real-world settings. This lets the onboard AI identify patterns—like increased licking, scratching, or barking—with 80 percent accuracy, flagging “meaningful changes in a dog’s behavior” that could presage health issues.

Veterinarians often stress that early detection is critical—subtle shifts in a dog’s routine, such as reduced water intake or extra restlessness, can hint at problems ranging from allergies to early joint issues. By translating raw motion into actionable insights, Fi aims to equip dog parents to be proactive, rather than reactive, about their pup’s well-being.

A smart collar is only as good as its ability to tell you where your dog is. Fi doubled the GPS signal sensitivity in the Series 3 Plus, compared to its predecessor, enabling faster, more accurate location fixes. Whether your pup darts into a thicket or slips out of the yard gate, the collar’s improved cellular link means you’ll know within seconds—a potentially lifesaving upgrade if Fido turns Houdini.

This enhancement isn’t just bragging rights; Fi points out that in real-world tests, the upgraded GPS “can make the difference between life and death if your dog escapes.”

One of the stand-out features of Series 3 Plus is its full Apple Watch app. Now, everything you love about the Fi mobile app—live location, daily activity summaries, behavior alerts, and more—sits right on your wrist. No more digging for your phone on a busy walk: just glance down to see if your pooch is scratching excessively at two miles’ distance, or if they’ve hit their daily step goal.

Fi promises the Watch experience retains “all the interactivity and intelligence” of the smartphone version, including the ability to customize safe-zone fences, check battery life, and receive instant escape notifications.

In a nod to true health-tech interoperability, the companion app’s new AI document analysis tool can scan and parse vet records, insurance bills, or prescription receipts. By extracting dates, diagnoses, and treatment notes, the system automatically enriches your pet’s profile—helping you correlate a spike in scratching with that recent ear-infection treatment, for instance.

While the tech suite is cutting-edge, some core features carry over from earlier Fi collars—and for good. The Series 3 Plus retains:

• IP68 waterproofing, tested to 50 meters in saltwater
• Three-month battery life on a single charge
• A built-in LED light for nighttime visibility
• Five adjustable sizes to fit necks from petite to XXL
• Four playful colors—yellow, blue, pink, and gray

No fumbling with charging cables in the rain or worrying about your labradoodle taking a swim: Fi’s rugged design has been proven over millions of dog-hours.

Rather than charging an upfront fee for the collar itself, Fi bundles hardware into a subscription plan starting at $14 per month. That covers:

• App and AI features (behavior alerts, document analysis, watch integration)
• Unlimited GPS tracking and safe-zone fencing
• Escape and low-battery notifications

Most competing smart-collar offerings tack on hardware costs or limit critical features behind premium tiers. Fi’s all-in-one model means no surprise fees—just one easy monthly charge.

For dog parents who crave data-driven insights—those quick to schedule that vet check if Rudy’s barking spikes—Fi Series 3 Plus is a quantum leap. With robust AI behavior detection, twice-sensitive GPS, Apple Watch convenience, and document-analysis smarts, it redefines what a “smart collar” can do. Priced competitively under $168 per year (hardware included), it’s a compelling choice for anyone who treats their pup like family—and wants the latest tech to help keep them healthy, safe, and happy.

Whether you’re an experienced pet-tech early adopter or simply curious about the future of canine care, Fi’s Series 3 Plus Collar is worth a spot in your dog-gear arsenal.